Shenzhen Goodix Technology has patented a system for low-noise self-capacitor sensing in touch panel arrays integrated with display panels. The system uses an AC-mode bridge to read out pairs of channels differentially, rejecting common-mode noise for accurate touch detection. GlobalData’s report on Shenzhen Goodix Technology gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Shenzhen Goodix Technology, AI-assisted biometric recognition was a key innovation area identified from patents. Shenzhen Goodix Technology's grant share as of January 2024 was 47%. Grant share is based on the ratio of number of grants to total number of patents.
Patent granted for low-noise self-capacitor sensing in touch panel
A recently granted patent (Publication Number: US11875006B1) discloses a system for self-capacitor sensing in a touch panel array integrated with a display panel. The system includes an AC-mode bridge with an error amplifier, adjustable current sources, and an output amplifier to generate output voltages based on self-capacitance values of different touch panel array channels. The system is designed to accurately detect touch events by accounting for display noise and touch capacitance variations, with the ability to handle common-mode noise on multiple channels.
Furthermore, the patent describes a method for self-capacitor sensing in the touch panel array, involving generating sinusoidal currents, driving different branches of the AC-mode bridge, and calculating output voltages based on the differences in branch voltages. The method includes steps to account for display noise, touch capacitance changes, and common-mode noise, ensuring precise touch event detection. Additionally, the method involves cycling through readout frames and utilizing adjustable current sources to optimize current generation for accurate sensing across multiple channels, enhancing the overall performance of the touch panel array integrated with the display panel.
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